Density and Temperature Demonstration

In the Density and Temperature Demonstration, there were 4 jars of water that were taken.  Two of the jars of water were heated up while two of the jars of water were cold.  On one side, a cold jar was put on top of the warm jar of water and on the other side, a warm jar of water was put on top of a cold jar of water.  On the side that had the cold jar on top, the cold water went down and joined the warm water at the bottom.  However, on the side where the warm jar was on top, the warm water stayed on the top and the cold water stayed on the bottom.  This showed me that not only density has an effect on aquatic ecosystems, but temperature does also.